Index: sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml
===================================================================
diff -u -rb395fdadb1ad460eba7e45eaca94c100a5d0c804 -r0d218c60b5108bf7f08558f4baa12f542efe6dbf
--- sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml	(.../PreTreatmentCreateContent.qml)	(revision b395fdadb1ad460eba7e45eaca94c100a5d0c804)
+++ sources/gui/qml/pages/pretreatment/create/PreTreatmentCreateContent.qml	(.../PreTreatmentCreateContent.qml)	(revision 0d218c60b5108bf7f08558f4baa12f542efe6dbf)
@@ -340,6 +340,7 @@
                     step            : _durationControl.step
                     defaultValue    : _durationControl.value
                     enabled         : vTreatmentCreate.heparinDispensingRate
+                    allowOff        : true
                     onValueChanged  : {
                         if ( ! _heparinStopTime.valid ) { vTreatmentCreate.heparinStopTimeRejectReason = Variables.noRejectReason }
                         vTreatmentCreate.heparinStopTime = value